port.java

手机短信编程的源代码

// Hardware dependant methods for the communication with the mobile phone over serial line
//
// file:    Port.java
// used by: Msg.java
//
// For comments see header of SMS.java.
//---------------------------------------------------------------------------------------

package smspack;

import java.io.*;
import java.rmi.*;
import java.util.*;
import javax.comm.*;

class Port {
  private static String portName;
  private static SerialPort port;
  private static OutputStreamWriter out;
  private static InputStreamReader in;

  private static String number;
  private static String message;
  private static boolean numbertype;       // national or international dialing number

  /** open the connection via the serial line
  * @throws Exception
  */
  public static void open() throws Exception {
    //----- open the connection via the serial line
    try {
      CommPortIdentifier portId = CommPortIdentifier.getPortIdentifier(SMS.COMPORT);
      port = (SerialPort)portId.open("SMS Transceiver", 10);  // open port
      // set parameter for serial port
      port.setSerialPortParams(19200, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
      out = new OutputStreamWriter(port.getOutputStream(), "ISO-8859-1");
      in = new InputStreamReader(port.getInputStream(), "ISO-8859-1");
      System.out.println("open port\n");    // for debugging
    } // try
    catch (Exception e) {
      SMS.showText("could not open port:" + e);
      System.exit(0);
    } // catch
  } // open


  /** sends an AT command to ME and receives the answer of the ME
   * @param atcommand AT command for the mobile phone
   * @return  answer string of the ME
   * @throws java.rmi.RemoteException
   */
  public static String sendAT(String atcommand) throws java.rmi.RemoteException {
    String s="";

    try {
      Thread.sleep(300);    // wait 300 msec [Timing]
      writeln(atcommand);   // send AT command to ME
      Thread.sleep(300);    // wait 300 msec [Timing]
      s = read();           // get response from ME
      Thread.sleep(300);    // wait 300 msec [Timing]
    } // try
    catch (Exception e) {
      SMS.showText("ERROR: send AT command failed; " + "Command: " + atcommand + "; Answer: " + s + "  " + e);
    } // catch
    return s;
  }  // sendAT

 /** write a string to the output buffer
  *  @param s string for the serial output buffer
  *  @throws Exception
  */
  public static void write(String s) throws Exception {
    out.write(s);
    out.flush();
  }  // write

  /** write a character to the output buffer
   *  @param s character for the serial output buffer
   *  @throws Exception
   */
  public static void write(char[] s) throws Exception {
    out.write(s);
    out.flush();
  }  // write

 /** write a string with CR at the end to the output buffer
  *  @param s string for the serial output buffer
  *  @throws  Exception
  */
  public static void writeln(String s) throws Exception {
    out.write(s);
    out.write('\r');
    out.flush();
    System.out.println("write port: " + s + "\n");    // for debugging
  }  // writeln

  /** receives a character string from the serial line
    * @return  received character string from ME
    * @throws Exception
    * Remark: Some mobile phones don't send one byte immediate after the other
    *         byte to the PC. Thus it is necessary to check (about) 5 times after
    *         a delay that all bytes are received. It is also important to collect
    *         the bytes not too fast, because this can result in some lost bytes.
    */
  public static String read() throws Exception {
    int n, i;
    char c;
    String answer = new String("");

   // do {                              // wait until the first byte is received
   //   Thread.sleep(100);              // wait at least 100 msec [Timing]
  //  } while (in.ready() == false);

    for (i = 0; i < 10; i++) {         // look 5 times for character string to receive
      //----- collect all characters from the serial line
      while (in.ready()) {            // there is a byte available
        n = in.read();                // get the byte from the serial line
        if (n != -1) {                // one byte received
          c = (char)n;                // convert the received integer to a character
          answer = answer + c;        // collect the characters from the serial line
          Thread.sleep(1);            // wait 1 msec between every collected byte from the mobile phone [Timing]
        } // if
        else break;                   // no more bytes available
      } // while
      Thread.sleep(100);              // wait 100 msec [Timing]
    }  // for
    System.out.println("read port: " + answer + "\n");    // for debugging
    return answer;                    // give the received string back to the caller
  } // read


  /** close the connection via the serial line
   * @throws Exception
   */
  public static void close() throws Exception {
    try {
      port.close();
      System.out.println("close port\n");    // for debugging
    } // try
    catch (Exception e) {
      SMS.showText("Error: close port failed: " + e);
    } // catch
  } // close


} // Port